EP0019281B1 - Procédé pour l'élimination d'agents de nitrosation de composés aromatiques nitrurés - Google Patents

Procédé pour l'élimination d'agents de nitrosation de composés aromatiques nitrurés Download PDF

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Publication number
EP0019281B1
EP0019281B1 EP80102695A EP80102695A EP0019281B1 EP 0019281 B1 EP0019281 B1 EP 0019281B1 EP 80102695 A EP80102695 A EP 80102695A EP 80102695 A EP80102695 A EP 80102695A EP 0019281 B1 EP0019281 B1 EP 0019281B1
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EP
European Patent Office
Prior art keywords
water
nitrated aromatic
water treatment
aromatic compounds
reduced pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP80102695A
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German (de)
English (en)
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EP0019281A3 (en
EP0019281A2 (fr
Inventor
Kurt Dr. Habig
Konrad Dr. Baessler
Lothar Dr. Schulz
Heinz Dr. Schütte
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Hoechst AG
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Hoechst AG
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Publication date
Priority claimed from DE19792920448 external-priority patent/DE2920448C3/de
Priority claimed from DE19803008243 external-priority patent/DE3008243A1/de
Application filed by Hoechst AG filed Critical Hoechst AG
Publication of EP0019281A2 publication Critical patent/EP0019281A2/fr
Publication of EP0019281A3 publication Critical patent/EP0019281A3/de
Application granted granted Critical
Publication of EP0019281B1 publication Critical patent/EP0019281B1/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C201/00—Preparation of esters of nitric or nitrous acid or of compounds containing nitro or nitroso groups bound to a carbon skeleton
    • C07C201/06—Preparation of nitro compounds
    • C07C201/16—Separation; Purification; Stabilisation; Use of additives
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
    • C07B43/00—Formation or introduction of functional groups containing nitrogen
    • C07B43/02—Formation or introduction of functional groups containing nitrogen of nitro or nitroso groups

Definitions

  • nitrated aromatic compounds are understood to mean aromatic nitro compounds which have been prepared by nitrating corresponding aromatic starting compounds with concentrated nitric acid or with nitrating acid (concentrated nitric acid / sulfuric acid) and customary processing. Aromatic nitro compounds which have been further implemented by reaction steps following the nitration are not to be understood here as “nitrated aromatic compounds”.
  • Nitrated aromatic compounds are end products and intermediates in various fields, in particular in the explosives, pharmaceutical and crop protection sectors.
  • This synthesis can be represented by the following reaction scheme:
  • nitrosamines have now been found in the trifluralin produced in this way, which can be carcinogenic at least in animals and are therefore extremely undesirable (see, for example, DE-OS 2 835 530).
  • the formation of these nitrosamines is likely to be based on the nitrosation of the di-n-propylamine used in the last reaction stage by nitrosating agents, which are present in a smaller amount in the precursor of trifluralin - in the 4-chloro-3,5-dinitrobenzotrifluoride - from the nitration reaction seem to be.
  • a treatment with bromine, chlorine, N-bromosuccinimide, N-chlorosuccinimide, bromochloride, pyridine perbromide and / or pyridinium bromide perbromide for the purpose of reducing the concentration of nitrosamine is also described in DE-OS 2 835 530 and a treatment with phosphorus or sulfur halides and oxihalides or described with TiCl 4 in DE-OS 2 837 529.
  • the subject of the invention is thus a process for the removal of nitrosating agent (s) from nitrated aromatic compounds by a water treatment, which is characterized in that the water used for the water treatment is at least partially removed again in vapor form.
  • nitrated aromatic compounds of the definition given at the outset can be considered as the nitrated aromatic compounds accessible to the process.
  • preference is given to nitrated aromatic compounds of the following general formula wherein the radicals R independently of one another and Hal F, Cl, Br, J, preferably Cl, Br.
  • Specific compounds covered by this formula are e.g. B .: Etc.
  • the starting compound which is particularly preferred for the process is the trifluralin precursor 4-chloro-3,5-dinitrobenzotrifluoride.
  • the water treatment according to the invention with simultaneous or subsequent at least partial removal of the water in the vapor state is generally carried out at temperatures between 80 and 120 ° C., preferably between 95 and 100 ° C.
  • the amount of water used for this can in principle be arbitrary, but it is preferred to measure the amount of water to 10 to 50% by weight, preferably 20 to 40% by weight, based on the nitrated aromatic starting compound.
  • the water treatment according to the invention is advantageously carried out in such a way that water vapor is passed through the nitrated aromatic starting compound (as in the case of steam distillation) or that the nitrated aromatic starting compound is heated with water to a temperature in the stated range and the water then at least partially - preferably under a weak vacuum at 95 to 100 ° C - distilled off.
  • the nitrated aromatic compound should preferably be in liquid or molten form.
  • the time for this water treatment with at least partial removal of the water in the vapor state is expediently between 10 and 60 minutes; Treatment times below and above this time range are possible depending on the batch size and the treatment conditions in detail (temperature, speed of water vapor conduction or distillation of the water, etc.), but generally without any particular advantage.
  • the water treatment is carried out in the form of a crystallization from aqueous solution or emulsion under reduced pressure, even at temperatures down to room temperature.
  • the last-described embodiment works in the crystallization range of the corresponding nitrated aromatic compounds - if they change from the liquid to the solid state - and when the nitrated aromatic compounds Connections are already firm.
  • a reduced pressure which allows the water to distill off, prevails during crystallization from aqueous solution or emulsion.
  • This pressure must therefore be below the vapor pressure of the water at the corresponding temperature. If there are still larger amounts of water, it is expedient if the reduced pressure used does not fall too far below the water vapor pressure at the respective temperature, so that undesired delays in boiling or the like do not occur.
  • animal pressure can be down to about 10 mbar. A sufficient water evaporation rate and trouble-free evaporation must always be guaranteed.
  • the temperatures of the last-mentioned embodiment of the invention are at the temperatures of the procedure described first, down to about room temperature (about 20 ° C.), that is between about 20 to 120 ° C.
  • room temperature about 20 ° C.
  • the temperatures depend in individual cases on the melting point of the respective nitrated aromatic Connection from; they move around this melting point and below.
  • the temperatures for the treatment of one and the same nitrated aromatic compounds are thus lower than in the first-mentioned embodiment, in which the nitrated aromatic compounds are practically always only in the liquid state. Temperatures below about 20 ° C. would in principle be possible for the water treatment according to the invention, but they have no advantages.
  • the nitrosating agents present as by-products in the nitrated aromatic starting compounds are likely to be split, decomposed and / or removed with the water vapor.
  • the process according to the invention advantageously differs from the known processes of removing the nitrosamines from the corresponding reaction products and the removal of nitrosating agent (s) from the nitrated aromatic compounds in particular in that it can be carried out in the simplest manner without the use of additional chemicals and process steps; since neutralization is generally carried out after the nitriding in order to purify the nitrated aromatic compound, the removal of the nitrosating agent (s) according to the invention can be carried out practically in the same process.
  • the embodiment of the method described in the second place is somewhat gentler compared to the first described because of the lower temperatures.
  • the invention therefore represents a significant advance.
  • nitrosamine concentration was after the z. B. determined in DE-OS 2831119 methods.

Claims (10)

1. Provédé pour éliminer, par un traitement à l'eau, un ou des agents de nitrosation contenus dans des composés aromatiques nitrés, procédé caractérisé en ce que l'eau utilisée pour ledit traitement à l'eau est éliminée à nouveau au moins partiellement à l'état de vapeur.
2. Procédé selon la revendication 1, caractérisé en ce qu'on utilise comme composés aromatiques nitrés, des composés répondant à la formule I
Figure imgb0011
dans laquelle
les R représentent chacon, indépendamment les uns des autres, H, un alkyle en C1-C4, CF3, SO2NH2 ou SO2CH3 et
Hal représente F, CI, Br ou I, de préférence CI ou Br.
3. Procédé selon l'une des revendications 1 et 2, caractérisé en ce qu'on utilise, comme composé aromatique nitré, le trifluorométhyl-1 dinitro-3,5 chloro-4 benzène.
4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le traitement par l'eau est effectué à des températures de 80 à 120°C, de préférence de 95 à 100°C.
5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'on utilise, pour le traitement à l'eau, une quantité d'eau de 10 à 50% en poids, de préférence de 20 à 40% en poids, par rapport au composé aromatique nitré.
6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que, pour effectuer le traitement par l'eau, on fait passer de la vapeur d'eau dans le composé aromatique nitré.
7. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que, pour effectuer le traitement par l'eau, on chauffe le composé aromatique nitré avec de l'eau et on chasse l'eau par distillation, éventuellement sous un léger vide, à des températures comprises entre 95 et 100° C.
8. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce qu'on effecture le traitement par l'eau pendant une durée de 10 à 60 minutes.
9. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le traitement par l'eau est effectué sous la forme d'une cristallisation dans une solution ou émulsion aqueuse, sous pression réduite.
10. Procédé selon la revendication 9, caractérisé en ce qu'on chasse encore au moins une partie de l'eau, également sous pression réduite, de la suspension de cristaux qui a été obtenue après la cristallisation dans la solution aqueuse sous pression réduite.
EP80102695A 1979-05-21 1980-05-15 Procédé pour l'élimination d'agents de nitrosation de composés aromatiques nitrurés Expired EP0019281B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE2920448 1979-05-21
DE19792920448 DE2920448C3 (de) 1979-05-21 1979-05-21 Verfahren zur Entfernung von Nitrosierungsmittel (n) aus nitrierten aromatischen Verbindungen
DE19803008243 DE3008243A1 (de) 1980-03-04 1980-03-04 Verfahren zur entfernung von nitrosierungsmittel (n) aus nitrierten aromatischen verbindungen
DE3008243 1980-03-04

Publications (3)

Publication Number Publication Date
EP0019281A2 EP0019281A2 (fr) 1980-11-26
EP0019281A3 EP0019281A3 (en) 1981-07-15
EP0019281B1 true EP0019281B1 (fr) 1982-12-29

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EP80102695A Expired EP0019281B1 (fr) 1979-05-21 1980-05-15 Procédé pour l'élimination d'agents de nitrosation de composés aromatiques nitrurés

Country Status (6)

Country Link
US (1) US4338473A (fr)
EP (1) EP0019281B1 (fr)
BR (1) BR8003157A (fr)
CA (1) CA1144943A (fr)
DE (1) DE3061492D1 (fr)
IL (1) IL60113A (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1131182B (it) * 1980-05-15 1986-06-18 Montedison Spa Processo di preparazione di n-di-n-propil-2,6-dinitro-4-trifluorometilanilina a basso contenuto di nitrosammine
US4440962A (en) * 1982-04-22 1984-04-03 Oxon Italia S.P.A. Process for removing nitrosating agents from 1-chloro-2,6-dinitro-4-(trifluoromethyl) benzene
DE3273513D1 (en) * 1982-04-22 1986-11-06 Oxon Italia Spa Process for preparing 1-chloro-2,6-dinitro-4-(trifluoromethyl) benzene free from nitrosating agents
IT1190440B (it) * 1985-12-18 1988-02-16 Finchimica Spa Procedimento migliorato per la purificazione della trifluralina
US4876388A (en) * 1986-07-31 1989-10-24 IΠCI. S.p.A. Method for the purification of trifuraline
US5728881A (en) * 1997-03-05 1998-03-17 Srm Chemical, Ltd. Co. Process for preparing trifluralin
US5922915A (en) * 1998-05-11 1999-07-13 Srm Chemical, Ltd., Co. Process for removing N-nitroso compounds from organo-amine compositions including dinitroaniline herbicides

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2835530A1 (de) * 1977-08-17 1979-03-01 Lilly Co Eli Verfahren zur reinigung von nitrosamine enthaltenden dinitroanilinen
DE2840551A1 (de) * 1977-09-21 1979-03-29 Lilly Co Eli Verfahren zur entfernung von nitrosierungsmitteln aus einem dinitrobenzol

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2435314A (en) * 1940-12-05 1948-02-03 Autoxygen Inc Method of nitrating organic compounds
US2786795A (en) * 1952-09-05 1957-03-26 Ethyl Corp Fungicidal trichlorodinitrobenzene compositions and methods of manufacturing and using same
US3169150A (en) * 1963-10-14 1965-02-09 Purdue Research Foundation Process for recovery of bromonitroalkane
US3409620A (en) * 1967-02-06 1968-11-05 Mario Biazzi Sa Dr Ing Continuous manufacture in vacuum of nitric esters and/or organic nitro compounds
US4028425A (en) * 1976-06-01 1977-06-07 The United States Of America As Represented By The Secretary Of The Army Continuous process for concurrent production of dinitrotoluene and high-strength nitric acid
IT1077080B (it) * 1976-10-22 1985-04-27 Montedison Spa Preparazione del 2,6 dinitro 4 trifluorometil clorobenzolo per nitrazione del 4 trifluorometil clorobenzolo in uno stadio
US4096195A (en) * 1977-05-13 1978-06-20 Gaf Corporation Cyclic two-stage nitration process for preparing 4-chloro-3,5-dinitrobenzotrifluoride from 4-chlorobenzotrifluoride
RO75656A (fr) * 1977-07-18 1981-04-20 Eli Lilly And Co,Us Procede pour la purification des dinitroanilines
US4180679A (en) * 1978-08-22 1979-12-25 American Cyanamid Company Novel substituted dinitrotoluenes and methods for preparing the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2835530A1 (de) * 1977-08-17 1979-03-01 Lilly Co Eli Verfahren zur reinigung von nitrosamine enthaltenden dinitroanilinen
DE2840551A1 (de) * 1977-09-21 1979-03-29 Lilly Co Eli Verfahren zur entfernung von nitrosierungsmitteln aus einem dinitrobenzol

Also Published As

Publication number Publication date
US4338473A (en) 1982-07-06
CA1144943A (fr) 1983-04-19
BR8003157A (pt) 1980-12-30
IL60113A0 (en) 1980-07-31
EP0019281A3 (en) 1981-07-15
DE3061492D1 (en) 1983-02-03
EP0019281A2 (fr) 1980-11-26
IL60113A (en) 1984-07-31

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